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They were OC's for a 444 nm pumped cavity to PR:YLF crystal to produce 607 nm, a company in Lithuania made them for me, I need to dig out the info to give you a name, escapes me right now. Edit: Optogama. I need to find the invoice, the email account I used in the past is now disabled, but I have...

Could you share what did you order (roughly, exact specs aren't critical), where and for how much? I'm trying to come up with open source manufacturer DB.

Yep, it's confirmed, chatgpt is stupid. I cannot rely on them for good answers. For my own projects, I don't want to use a lens which isn't AR coated either, but difficult to find what I need with coatings. I had to special order some OC mirrors made with the coatings I needed once, cost me near...

And that's because GPTchat is stupid! SHG as the name suggests will always output 532nm from 1064nm, but if phase matching condition is not matched the output power will be very, very low. There's another option - DFG which would downconvert signal to MIR signal and idler but without extreme input...

Last I heard the ebay seller I linked to thinks he has what he needs. On another subject, highjacking this thread for only a short while, does anyone know what the SHG output wavelength would be for a KTP crystal which is cut for a 47.5 degree phase angle when pumped with 1064 nm, for either...